Na₂CO, NaHCO₃and their mixture, which were added to the carnallite solution, converted MgCl₂into MgCO₃·3H₂O, and from this solution the Engel salt was deposited by carbonatation. The most suitable amount of the salts for the precipitation of the Engel salt was investigated. To get the product of good quality, the suitable amounts Na₂CO₃and NaHCO₃were 1.5-1.2 times equivalents of the content of MgCl₂in the carnallite, but their yields were 70%-50%. When NaHCO₃was used, the carbonatation process was not needed for the precipitation of Engel salt, but the yields ware very bad (below 50%). The mixture of Na₂CO₃and NaHCO₃could get the best results in the purity of the product and the yield of potassium.

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For the direct electrolytic separation of dissolved magnesium and calcium in the sea water, a process which used a diaphragm and removed magnesium completly as hydroxide has been deviced.
In this report, under the constant current density and agitation in 30°C, the effect of quantity of clectrolytic current on the variations of sodium, potassium, sulfate, and bromine ion concentration, the transport of these ions, decomposition ratio of bromide, and the ratio of sulfate to magesium in precipitate were studied.
And then the relations between above characteristic values and the quantity of eletrolyrtic current were determined.
Bromine ion behaved the same as chlorine ion in electrolyte, and the decomposition ratio of both ions were nearly equal.
However, it was considered that, in anolyte, chlorine ion was oxidized mostly to chlorine gas and went away from the solution, but bromine ion was apt to remain in the solution almost as bromate, and so, the oxidation reaction to bromate might be took place with good reproducibility by preparing the electrolyte properly, and controlling the electrolytic conditions.

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Fifty horse-mackerels Trachurus japonicus (TEMMINCK and SCHLEGEL) were separated into five groups according to the amount of the antioxidants, BHA or BHT, which were contained or not contained in the table salt, and then each group was salted by a dry salting method for 20 days at 15°. using 30% of the salt in weight to the total fish of one group. The results obtained were summerized as follows:
1) The table salt mixed with 1% of BHT showed some obstruction to the salt permeation, but the salt with 0.02% of BHT showed no such effect. It was noted that the results obtained were the same as those of the previous paper.
2) The table salt coated with 0.01% of BET or 0.02% of BHA·BHT (half and half) did not show obstruction effect. These results are different from those of the previous experiments.
3) In view of the above results the author considered that a very small quantity of the antioxidants would not obstruct the salt permeation into fish meat for practical use.
4) The table salt containing BHA turned into brown colour during the experiment and the gloss of the fish vanished. These phenomena lowered the commercial value of the salted fish.

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When sea water or brine are treated with slaked lime, Mg²⁺is separated as hydroxide. And small quantity of SO₄^2-is deposited as calcium salts during the early stages of the concentration and thus removed from the solution before it becomes saturated with any other salts. The solution may be considered to form the quaternary system CaCl₂-KCI-NaCl-H₂O. So, the author investigated the following 2 relations.
(1) The isotherms for the quaternary system CaCl₂-KCl-NaCl-H₂O were determined at 25°. 0° and -10°C.
(2) The solution was evaporated at the boiling point to various degrees of concentration, cooled down to 25° or 0°C, and alkali chlorides were deposited out. The amounts of alkali chlorides obtained were compared with the values calculated by using the equilibrium diagram. As the result, it was found that these two results coincided fairly well.

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Calcium hydro ychloride is known as the double salts which have been a chemical composition of x Ca(OH) ₂·y CaCl₂·zH₂O. At first, we investigated on the equilibrium of the system Ca(OH)₂-CaCl₂-H₂O, because there are various types of double salts reported of which the conditions for preparation are not known exactly. And then, the equilibrium of the system Ca(OH) ₂-CaCl₂-KCl-NaCl-H₂O were similarly studied, in order to know the condition to get these double salts from sea water, brine or bittern of which Mg²⁺had already been replaced with Ca²⁺completely by the treatment with slaked Iime.
As the results of measuring these two kinds of equilibrium, we confirmed that two kinds of double salt existed in these systems and their chemical compositions were shown with 3, 1, 13 and 1, 1, 1 as regard to x, y, z respectively in the above mentioned formula, and then, the conditions for their preparation computed.
We discussed the removal of calcium chloride from de-magnesiumed sea water, brine or bittern by separating such double salts, and concluded that it is impossible to get the double salts from such a dilute solutions of calcium chloride as de-magnesiumed sea water or brine, and only possible when mother liquor or bittern contains 8% or more calcium chloride.

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